1 has problems. There are two main clauses there.
Clause #1 = It is December 7, 1941,
Clause #2 = there ... Hawaii.
3. correct (unless fleet is supposed to have a capital F on it ... does it?)
4. This is another one that has two clauses. Can you see them?
5. incorrect; what are?
5. memorials (are)
#5 is now correct.
Just focusing on the verbs put in parentheses in 1 and 4 ...
#1 - verb is is or are -- what ONE WORD is the subject? And which verb will you choose?
#4 - Consider only the clause in quotation marks. What is the subject and what is the matching verb?
1. Pearl Harbor (is)
4. Japan (is)
#1 -- WHAT is??
#4 is now correct.
1. December 7, 1941 (is)
No. Only in THIS clause:
" ... there (is, are) a surprise attack on Pearl Harbor, Hawaii."
[On December 7, 1941, what happened?]
Okay, in rereading this entire thread, let me point out that the only thing wrong with your first answer for #1 was the subject. The subject in that clause is ONE word. You posted two words for the subject, at first. Which ONE is the subject?
1. attack (is)
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